ISSN:
1435-1536
Keywords:
Thermotropic
;
electron diffraction
;
microdiffraction
;
banded structure
;
orientation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract A detailed analysis of selected area electron diffraction patterns of a thermotropic liquid crystalline polymer exhibiting the banded structure, shows that the molecular trajectory is not sinusoidal in form, as was indicated by preliminary observations of the structure in the optical microscope. The use of electron microdiffraction techniques (for regions ∼150 nm in diameter) also supports the view that significantly more molecules are oriented parallel to the shear direction than predicted by a sinusoidal trajectory. Microdiffraction further shows that the “micro-orientation” of the molecules is significantly better than is apparent from X-ray or selected area electron diffraction patterns. The apparent contradiction with the optical microscopy measurements is discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01421431
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